Tollgrade Communications Inc. is venturing into the growing Internet protocol TV business.

The Harmar-based maker of network test software and products said it has an agreement with Mariner Partners Inc. of Canada for a customized version of Mariner’s xVu TV Care — used to check IPTV systems for high-quality picture and sound delivery to subscribers.

Tollgrade said it will integrate xVu technology into its Stratum service assurance platform, which is in customer trials.

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